CN110744887B - Magnesium-lithium-based composite material with high electromagnetic shielding performance and preparation method thereof - Google Patents
Magnesium-lithium-based composite material with high electromagnetic shielding performance and preparation method thereof Download PDFInfo
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- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000001989 lithium alloy Substances 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 30
- 229910000733 Li alloy Inorganic materials 0.000 claims abstract description 23
- 239000010410 layer Substances 0.000 claims abstract description 18
- 239000011358 absorbing material Substances 0.000 claims abstract description 12
- 229910019400 Mg—Li Inorganic materials 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 6
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- 239000000463 material Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
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- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
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- 241000282414 Homo sapiens Species 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
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- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
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- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(II) nitrate Inorganic materials [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
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- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Inorganic materials [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
- B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
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Abstract
The invention provides a magnesium-lithium based composite material with high electromagnetic shielding performance and a preparation method thereof, and the magnesium-lithium based composite material comprises the following components in percentage by weight: using bidirectional Mg-Li alloy as matrix, Ni0.4Zn0.4Co0.2Fe2O4The powder is used as interlayer additive; wherein Li in the magnesium-lithium alloy accounts for 5.7-10.3 wt%, and the balance is Mg, and the method comprises the following steps: preparing a magnesium-lithium alloy; preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder; and (4) preparing the magnesium-lithium based composite material by accumulative pack rolling. The invention designs and prepares a magnesium-lithium based composite material by combining the electromagnetic shielding mechanism of a shielding body, obtains good reflection loss R and multiple reflection loss B by an accumulative pack rolling processing technology, and simultaneously introduces a wave-absorbing material Ni between laminated layers0.4Zn0.4Co0.2Fe2O4And (3) obtaining good absorption loss by powder, thus obtaining the magnesium-lithium based composite material with high electromagnetic shielding performance.
Description
Technical Field
The invention relates to a magnesium-lithium based composite material and a preparation method thereof, in particular to a magnesium-lithium based composite material with high electromagnetic shielding performance and a preparation method thereof.
Background
At present, the development of modern science and technology enables various electronic devices to provide great convenience for social production and human life. Meanwhile, the electromagnetic radiation and interference generated by the electronic equipment in the working process can influence the production and life of people, so that the electromagnetic environment of the living space of people is increasingly worsened. Electromagnetic radiation has become a new pollution source which is subsequent to water sources, atmosphere and noise, has great harmfulness and is not easy to protect, not only affects the normal use of electronic equipment, but also directly threatens the health of human beings, and becomes a hot problem concerned by the society and the scientific community. The most effective measure for controlling electromagnetic radiation pollution is electromagnetic shielding, which is mainly aimed at preventing the influence of radio frequency electromagnetic waves and suppressing the radiation intensity within a safe range. Therefore, it is important for research and development of shielding materials.
The transmission line theory is a common analysis method for explaining the electromagnetic wave shielding mechanism due to its convenient calculation, high precision and easy understanding. The transmission line theory is that the material is regarded as a transmission line, and when the electromagnetic wave approaches the surface of the shielding body, the intrinsic impedance (Z) is obtainedr) Impedance (Z) with electromagnetic wave propagation medium0) Instead, the electromagnetic wave is reflected at the outer surface for a portion (reflection loss R) and the remaining portion penetrates the shield and travels forward. The intensities of the reflected and transmitted waves depend on the impedance of the medium and material. During transmission, the electromagnetic wave is continuously attenuated by the shield (absorption loss A) and is reflected multiple times between two interfaces of the shield (multiple reflection loss B), and finally transmission is completed. Therefore, the electromagnetic shielding mechanism of the shield includes reflection loss R of the surface of the shield, absorption loss a of the shielding material, and multiple reflection loss B inside the shield. In order to obtain a shield having excellent electromagnetic shielding performance, the above aspects should be considered.
Disclosure of Invention
The invention aims to provide a magnesium-lithium-based composite material with excellent electromagnetic shielding performance in a ultrahigh frequency band and a preparation method thereof.
The purpose of the invention is realized as follows:
a magnesium-lithium based composite material with high electromagnetic shielding performance comprises the following components in percentage by weight: using bidirectional Mg-Li alloy as matrix, Ni0.4Zn0.4Co0.2Fe2O4The powder is used as interlayer additive; wherein Li in the magnesium-lithium alloy is 5.7-10.3 wt%, the balance being Mg;
a preparation method of a magnesium-lithium based composite material with high electromagnetic shielding performance comprises the following steps:
the method comprises the following steps: preparing a magnesium-lithium alloy;
step two: preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder;
step three: and (4) preparing the magnesium-lithium based composite material by accumulative pack rolling.
The invention also includes such features:
the third step is specifically as follows: cutting a magnesium-lithium alloy ingot into block-shaped samples, removing an oxide layer on the surface of the samples, reducing the sample by 20 percent in a single pass at the temperature of 200 ℃ and the rolling speed of 300 r/min, finally pressing the sample into a plate-shaped sample with the initial thickness of 10mm to be 2mm, taking three rolled plate-shaped samples to perform subsequent accumulative roll processing, and adding 4-8 percent of Ni in mass ratio into each layer before accumulative roll processing0.4Zn0.4Co0.2Fe2O4Powder, namely putting the combined material into a resistance furnace at 250 ℃ for heat preservation for 15min, then performing multi-pass cumulative overlapping rolling when the initial reduction is more than 50% under the condition that the rolling speed is 300 revolutions per minute, and finally preparing a magnesium-lithium-based composite plate with the initial thickness of 6mm under the reduction condition;
the first step is specifically as follows: preparing raw materials according to the alloy components and mass percentage content of 5.7-10.3 wt% of Li and the balance of Mg, wherein the mass purity of each chemical substance is 99.9%; adding the prepared raw materials into a smelting crucible of a vacuum smelting furnace, closing a furnace cover of the vacuum induction smelting furnace, extracting air in the furnace to enable the pressure in the furnace to be below 1 x 10 < -2 > Pa, introducing argon into the vacuum induction furnace to enable the pressure in the furnace to be maintained at 0.04-0.05MPa, starting a high-frequency induction heating device of the vacuum induction furnace, smelting at 700 +/-15 ℃, keeping the temperature for 8-10 minutes at constant temperature, finally pouring a magnesium-lithium alloy melt into an open-close type mold through a rocker arm, cooling along with the furnace, taking out an ingot, namely a magnesium-lithium alloy ingot, and preserving the temperature of the obtained magnesium-lithium alloy ingot in a heat treatment furnace at 220 ℃ for 8 hours for homogenization treatment;
preparation of Ni by sol-gel spontaneous combustion method0.4Zn0.4Co0.2Fe2O4Nanoparticle ferrite, in accordance with Ni2+:Zn2+:Co2+:Fe3+:C6H8O7·H2Preparing raw materials with a molar ratio of O to O of 0.4:0.4:0.2:2:3, dissolving the prepared raw materials in 100ml of deionized water, vigorously stirring and mixing the reactants together, then dropwise adding ammonia water to adjust the pH value of the suspension to about 7, continuously magnetically stirring the suspension at 80 ℃ for about 6 hours until the solution viscosity rises to a dark-colored gelatinous liquid, then performing a series of heat treatment processes, firstly, drying the dark-colored gelatinous liquid in an oven at 150 ℃ for 10 hours, secondly, igniting the dried gel to obtain loose powder, finally, calcining the loose powder at 1100 ℃ for 3 hours to decompose all organic substances, and then obtaining the required ferrite by slowly cooling the powder to ambient temperature.
Compared with the prior art, the invention has the beneficial effects that:
the magnesium-lithium based composite material obtained by the invention has excellent electromagnetic shielding performance, low cost and simple manufacture, and is beneficial to popularization;
in recent years, no report is found in the research of foreign scholars aiming at the aspect of magnesium alloy electromagnetic shielding at present, and the domestic scholars improve the electromagnetic shielding performance of the magnesium alloy mainly by improving the conductivity performance of the alloy. The invention designs and prepares a magnesium-lithium based composite material by combining the electromagnetic shielding mechanism of a shielding body, obtains good reflection loss R and multiple reflection loss B by an accumulative pack rolling processing technology, and simultaneously introduces a wave-absorbing material Ni between laminated layers0.4Zn0.4Co0.2Fe2O4And (3) obtaining powder, and obtaining the magnesium-lithium-based composite material with excellent electromagnetic shielding performance in a super-high frequency band due to good absorption loss.
Drawings
FIG. 1 shows a wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4SEM image of powder;
FIG. 2 is a schematic structural diagram of the magnesium-lithium based composite material;
FIG. 3 is a graph of the shielding effectiveness of the magnesium-lithium based composite material at 30MHz to 3000 MHz.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The magnesium-lithium based composite material comprises the following components in percentage by weight:
1)Mg-(5.7-10.3wt％)Li；
2)Ni0.4Zn0.4Co0.2Fe2O4powder:
Ni(NO3)2·6H2O:Zn(NO3)2·6H2O:Co(NO3)2·6H2O:Fe(NO3)3·9H2O:C6H8O7·H2the molar ratio of O is 0.4:0.4:0.2:2:3, 100ml of deionized water and a proper amount of ammonia water.
The preparation method of the magnesium-lithium-based composite material with excellent electromagnetic shielding performance comprises the following steps:
1) preparation of magnesium-lithium alloy
Preparing raw materials according to the alloy components and mass percentage content of Li (5.7-10.3 wt%), and the balance of Mg, wherein the mass purity of each chemical substance is 99.9%; adding the prepared raw materials into a melting crucible of a vacuum melting furnace, closing a furnace cover of the vacuum induction melting furnace, and extracting air in the furnace to ensure that the pressure in the furnace is below 1 multiplied by 10 < -2 > Pa. Then argon is introduced into the vacuum induction furnace to maintain the pressure in the vacuum induction furnace at 0.04-0.05 MPa. Starting a high-frequency induction heating device of the vacuum induction furnace, and keeping the melting temperature at 700 +/-15 ℃ for 8-10 minutes at the constant temperature. And finally, pouring the magnesium-lithium alloy melt into an open-close type mould through a rocker arm, cooling along with the furnace, and taking out the cast ingot, namely the magnesium-lithium alloy ingot. And (3) preserving the heat of the obtained magnesium-lithium alloy ingot in a heat treatment furnace at 220 ℃ for 8 hours for homogenization treatment.
2) Preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder of
Preparation of Ni by sol-gel spontaneous combustion method0.4Zn0.4Co0.2Fe2O4A nanoparticle ferrite. According to Ni2+:Zn2+:Co2+:Fe3+:C6H8O7·H2The molar ratio of O is 0.4:0.4:0.2:2: 3. The prepared raw materials were dissolved in deionized water (100 ml). The reactants were mixed together with vigorous stirring and then aqueous ammonia was added dropwise to adjust the pH of the suspension to around 7. The suspension was magnetically stirred continuously at 80 ℃ for about 6 hours until the solution viscosity increased to a dark gel-like liquid. Followed by a series of heat treatment processes. First, the dark gel-like liquid was dried in an oven at 150 ℃ for 10 hours. Next, the dried gel was ignited to obtain a loose powder. Finally, the bulk powder was calcined at 1100 ℃ for 3 hours to decompose all organic material, and then the desired ferrite was obtained by slowly cooling the powder to ambient temperature. The microstructure of the obtained ferrite is shown in figure 1.
3) Preparation of magnesium-lithium based composite material by accumulative pack rolling
Before rolling, the magnesium-lithium alloy ingot is cut into block-shaped samples by wire cutting, and oxide layers on the surfaces of the samples are brushed by a steel wire brush. Under the conditions of 200 ℃ and the roller speed of 300 r/min, the plate-shaped sample is pressed by 20 percent in a single pass, and finally the plate-shaped sample is pressed into a plate-shaped sample with the initial thickness of 10 mm. Three rolled plate-like samples were taken and subjected to the subsequent accumulative double rolling treatment. Before the accumulative pack rolling, a steel wire brush is used for brushing off an oxide layer on the surface of a sample, and Ni with the mass ratio of 4-8 percent is added into each layer0.4Zn0.4Co0.2Fe2O4And (3) powder. And (3) putting the combined material into a resistance furnace at 250 ℃ for heat preservation for 15min, then carrying out multi-pass accumulated rolling under the condition that the rolling speed is 300 revolutions per minute and the initial reduction is more than 50%, and finally preparing the magnesium-lithium-based composite board with the initial thickness of 2mm under the reduction of 6 mm.
4) Detection, analysis, characterization
And detecting, analyzing and representing the electromagnetic shielding performance of the prepared magnesium-lithium alloy plate.
The invention takes Mg- (5.7-10.3 wt%) Li alloy as a matrix, utilizes the excellent electromagnetic shielding performance of the two-phase magnesium-lithium alloy, and introduces a wave-absorbing material in the accumulation pack rolling, thereby further improving the electromagnetic shielding performance, and the structural schematic diagram of the material is shown in figure 2.
The electromagnetic shielding performance of the magnesium-lithium based composite material is 112.91dB at 30MHz, 109.20dB at 800MHz, 106.57dB at 1500MHz and 104.14dB at 3000 MHz. The electromagnetic shielding performance is obviously higher than that of the common accumulated and rolled Mg-9Li alloy plate, which is shown in figure 3. The wave absorbing material added between the accumulating and rolling layers is favorable for absorbing the electromagnetic waves entering the matrix, so that the absorption loss of the shielding body is increased, and a good shielding effect is achieved.
A magnesium-lithium based composite material with excellent electromagnetic shielding performance is characterized in that a biphase Mg-Li alloy ingot is cut into 125mm multiplied by 40mm multiplied by 10mm by wire cut by an electric spark, and the surface of a sample is polished after the cut. Then, the mixture was held at 200 ℃ for 15 minutes in a resistance furnace and rolled in a vertical mill at 300 revolutions per minute. The reduction amount of each pass is controlled to be 20 percent, the steel is rolled from 10mm to 2mm, and the total reduction amount is 80 percent. The three rolled plate-like samples were subjected to the subsequent accumulative double rolling treatment. Before the accumulative pack rolling, the oxide layer on the surface of the sample is brushed off by a wire brush, and Ni with the mass ratio of 4 percent is added into each layer0.4Zn0.4Co0.2Fe2O4And (3) powder. And (3) putting the combined material into a resistance furnace at 250 ℃ for heat preservation for 15min, then under the condition that the roller speed is 300 revolutions per minute, the initial reduction is more than 50%, and finally, the magnesium-lithium based composite board with the initial thickness of 2mm is prepared by the reduction of 6 mm.
The alpha phase and the beta phase which are peculiar to the biphase Mg-Li alloy are used, and the interface density of the phases is increased through a rolling process with large deformation, so that the electromagnetic waves can complete multiple reflection loss in the alloy. By adopting the accumulative pack rolling process, the wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4 nano ferrite is added between the stacked layers, thereby effectively absorbing the electromagnetic waves entering the matrix and increasing the absorption loss of the electromagnetic waves. The advantages of the above points are combined, so that the shielding effect of the shielding body on the electromagnetic wave is increased.
The Mg-Li alloy is selected as a matrix, and the Mg-Li alloy comprises the components with the mass percentage of Li (5.7-10.3 wt%) and the balance of Mg. Preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder, all chemicals used here were 99.9% pure by mass. Cutting the Mg-Li alloy ingot into 125mm multiplied by 40mm multiplied by 10mm by wire-cut electrical discharge machining, and polishing the surface of the sample after cutting. Then, the mixture was held at 200 ℃ for 15 minutes in a resistance furnace and rolled in a vertical mill at 300 revolutions per minute. The reduction amount of each pass is controlled to be 20 percent, the steel is rolled from 10mm to 2mm, and the total reduction amount is 80 percent. The three rolled plate-like samples were subjected to the subsequent accumulative double rolling treatment. Before the accumulative pack rolling, the oxide layer on the surface of the sample is brushed off by a wire brush, and Ni with the mass ratio of 4 percent is added into each layer0.4Zn0.4Co0.2Fe2O4And (3) powder. And (3) putting the combined material into a resistance furnace at 250 ℃ for heat preservation for 15min, then under the condition that the roller speed is 300 revolutions per minute, the initial reduction is more than 50%, and finally, the magnesium-lithium based composite board with the initial thickness of 2mm is prepared by the reduction of 6 mm. And carrying out metallographic observation, SEM observation, XRD phase analysis, VSM test and electromagnetic shielding performance test on the obtained magnesium-lithium based composite material. The results show that Ni is added between the layers0.4Zn0.4Co0.2Fe2O4The electromagnetic shielding performance of the magnesium-lithium based composite material of the powder is 112.91dB at 30MHz, 109.20dB at 800MHz, 106.57dB at 1500MHz and 104.14dB at 3000 MHz. The electromagnetic shielding performance of the alloy plate is obviously higher than that of the common accumulated and rolled Mg-Li alloy plate.
In summary, the following steps: the invention provides a magnesium-lithium-based composite material with excellent electromagnetic shielding performance in a ultrahigh frequency band and a preparation method thereof, wherein the preparation method comprises the following steps: selecting a biphase Mg-Li alloy as a matrix and Ni0.4Zn0.4Co0.2Fe2O4The magnesium-lithium-based composite material with excellent electromagnetic shielding performance is prepared by using nano ferrite powder as an interlayer additive through an accumulative pack rolling process. The magnesium-lithium based composite material obtained by the invention has excellent electromagnetic shielding performance, low cost and simple manufactureAnd is favorable for popularization.
Claims (3)
1. A magnesium-lithium based composite material with high electromagnetic shielding performance is characterized by comprising the following components in percentage by weight: using bidirectional Mg-Li alloy as matrix, Ni0.4Zn0.4Co0.2Fe2O4The powder is used as interlayer additive; wherein Li in the magnesium-lithium alloy accounts for 5.7-10.3 wt%, and the balance is Mg; the preparation method comprises the following steps:
the method comprises the following steps: preparing a magnesium-lithium alloy, wherein Li in the magnesium-lithium alloy accounts for 5.7-10.3 wt%, and the balance is Mg;
step two: preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder;
step three: preparing a magnesium-lithium based composite material by accumulative pack rolling; cutting a magnesium-lithium alloy ingot into block-shaped samples, removing an oxide layer on the surface of the samples, reducing the sample by 20 percent in a single pass at the temperature of 200 ℃ and the rolling speed of 300 r/min, finally pressing the sample into a plate-shaped sample with the initial thickness of 10mm to be 2mm, taking three rolled plate-shaped samples to perform subsequent accumulative roll processing, and adding 4-8 percent of Ni in mass ratio into each layer before accumulative roll processing0.4Zn0.4Co0.2Fe2O4And (2) powder, namely putting the combined materials into a resistance furnace at 250 ℃ for heat preservation for 15min, then performing multi-pass cumulative overlapping rolling under the condition that the rolling speed is 300 r/min and the initial reduction is more than 50%, and finally preparing the magnesium-lithium-based composite board with the initial thickness of 6mm under the reduction.
2. A preparation method of a magnesium-lithium based composite material with high electromagnetic shielding performance is characterized by comprising the following steps:
the method comprises the following steps: preparing a magnesium-lithium alloy, wherein Li in the magnesium-lithium alloy accounts for 5.7-10.3 wt%, and the balance is Mg;
step two: preparation of wave-absorbing material Ni0.4Zn0.4Co0.2Fe2O4Powder;
step three: preparing a magnesium-lithium based composite material by accumulative pack rolling; cutting magnesium-lithium alloy ingot into blocksRemoving oxide layer on the surface of the sample, pressing for 20% in one pass at 200 deg.C and at a rolling speed of 300 r/min, pressing into 2mm plate sample from 10mm, collecting three rolled plate samples, performing subsequent accumulative rolling, and adding 4-8% Ni in each layer before accumulative rolling0.4Zn0.4Co0.2Fe2O4And (2) powder, namely putting the combined materials into a resistance furnace at 250 ℃ for heat preservation for 15min, then performing multi-pass cumulative overlapping rolling under the condition that the rolling speed is 300 r/min and the initial reduction is more than 50%, and finally preparing the magnesium-lithium-based composite board with the initial thickness of 6mm under the reduction.
3. The preparation method of the magnesium-lithium based composite material with high electromagnetic shielding performance according to claim 2, wherein the second step is specifically as follows: preparation of Ni by sol-gel spontaneous combustion method0.4Zn0.4Co0.2Fe2O4Nanoparticle ferrite, in accordance with Ni2+:Zn2+:Co2+:Fe3+:C6H8O7·H2Preparing raw materials with a molar ratio of O to O of 0.4:0.4:0.2:2:3, dissolving the prepared raw materials in 100ml of deionized water, vigorously stirring and mixing the reactants together, then dropwise adding ammonia water to adjust the pH value of the suspension to about 7, continuously magnetically stirring the suspension at 80 ℃ for about 6 hours until the solution viscosity rises to a dark-colored gelatinous liquid, then performing a series of heat treatment processes, firstly, drying the dark-colored gelatinous liquid in an oven at 150 ℃ for 10 hours, secondly, igniting the dried gel to obtain loose powder, finally, calcining the loose powder at 1100 ℃ for 3 hours to decompose all organic substances, and then obtaining the required ferrite by slowly cooling the powder to ambient temperature.
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